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Evaluation of methanotroph (Methylococcus capsulatus, Bath) bacteria meal as an alternative protein source for growth performance, digestive enzymes, and health status of Pacific white shrimp (Litopenaeus vannamei)

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Abstract

The increasing cost of fishmeal (FM) with limited supply and the continuous development of aquaculture necessitate more economical FM substitutes. This study aimed to appraise the effects of dietary methanotroph (Methylococcus capsulatus, Bath) bacteria meal, a kind of methane-utilizing bacteria protein (MBP), replacing fishmeal on the growth and feed utilization, serum biochemical parameters, antioxidant status, and digestive enzyme activities of Pacific white shrimp (Litopenaeus vannamei). Seven isonitrogenous and isoenergetic diets were designed with 0%, 6.89%, 13.92%, 21.09%, 28.40%, 35.85%, and 43.46% MBP replacing FM, and fed to Pacific white shrimp (mean initial weight 0.27 ± 0.02 g) for 8 weeks. The shrimp fed with 28.40%, 35.85%, and 43.46% MBP diets showed significantly higher weight gain and specific growth rate compared to the control group (P < 0.05), while the other MBP diets had no significant effect on the growth performance (P > 0.05). No statistical differences were found in the activities of digestive enzymes in the stomach, hepatopancreas, and midgut among shrimp fed the dietary treatments (P > 0.05). Furthermore, antioxidant parameters in serum and hepatopancreas showed no significant differences among all the groups (P > 0.05). In conclusion, it was revealed that MBP replacing from 28.40 to 43.46% FM in the diet with appropriate supplementation of essential amino acids significantly improved the growth of Pacific white shrimp without adverse effects on feed utilization, digestive enzyme activities, physiological condition, and antioxidant status. This study provides a reference for replacing FM with MBP in the diet of Pacific white shrimp.

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Acknowledgements

We are grateful to the Mariculture Research Institute of Zhejiang Province for providing the experimental shrimp, the Key Lab of Mariculture and Breeding of Zhejiang Province, and China-Norwegian Joint Laboratory of Nutrition and Feed for Marine Aquaculture for providing the rearing system and logistical support during the shrimp growth trial. Thanks also go to Calysta, Inc., CA, USA, for supplying the methanotroph (Methylococcus capsulatus, Bath) bacteria meal (FeedKind®) in this study.

Funding

This work was supported by China National Ministry of Science and Technology (Funding No. 2020YFD0900801).

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Contributions

Qingjun Shao designed the study and provided the fund support. Kai Chen conducted the experiment, analyzed the data, and wrote the manuscript. Gladstone Sagada and Bingying Xu helped to take samples and revise the manuscript. Yuechong Liu, Lu Zheng, Arnaud Fabrice Tegomo, Yifei Yang, and Yuxiao Sun participated in the feeding trial and subsequent analysis. Jia Wang and Matt Longshaw helped to revise the manuscript.

Corresponding author

Correspondence to Qingjun Shao.

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The procedures and protocols for this study have been ethically reviewed and approved according to the guidelines of the relevant institutional committees and granted an Aquaculture Research Permit.

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No conflict of interest exists in the submission of this manuscript, and the manuscript is approved by all authors for publication. I would like to declare on behalf of my co-authors that the work described was original research that has not been published previously, and not under consideration for publication elsewhere, in whole or in part. All the authors listed have approved the manuscript that is enclosed.

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Chen, K., Sagada, G., Xu, B. et al. Evaluation of methanotroph (Methylococcus capsulatus, Bath) bacteria meal as an alternative protein source for growth performance, digestive enzymes, and health status of Pacific white shrimp (Litopenaeus vannamei). Aquacult Int 30, 1693–1710 (2022). https://doi.org/10.1007/s10499-022-00869-9

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  • DOI: https://doi.org/10.1007/s10499-022-00869-9

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